Balance beam



`I11) 9, lV929- J. P. MLLER' 1.719.901A

BALANCE BEAM Fled May 19, 1928 lllnwlll f |||||ul Patente'd July Y9, 1929.

JOHN P. MLLER, or `innw ROCHELLE, NEW Yoan.

. BALANCE BEAM.

Appnanon med 4May 19, i928. serial No. 278,993.

My invention relates to improvements in the beams of scales or balances, particularly of that class of beams in which the bearings are equidistant from the fulcrum of the beam and 5 which are usually` designed for the greatest possible lightness for a given carrying capacity, such as are used in combination with instruments of great precision and sensitiveness, as for instance analytical and assay balances, and it is theprincipal object of my invention to provide such a beam with a system `of graduations comprising a series' of graduations capable Vof dividing certain units of weight, such vasthe gram into the subdivisions vusual in instrumentsA of the class described, the purposes being to eliminate the'useof a multiple -of fractional weights ordinarily placed upon the pans of the instrument to effect apoise in weighing and @withoutthe necessity vof employing, auxiliary scales, as such scales increase the Weight of the beam and thereby decrease or hamper the sensitiveness of the instrument. To accomplish the aforesaid objects, I provide a beamwith bearings equidistant from the fulcrum of the beam, the arms of which to both sides of the fulcrum are equipped with different graduations, as for instance, milligram graduations on the left arm and centigra-m graduations on the right arm, or a combination of centigram and decigram graduations on the right arm, according to whether' a single poise or rider suspension or a modification of same is used.

Another object of my invention is to rovide Aa scale beam or balance beam in w ich the graduations on one of its arms range from 0 to O, for instance from the left to the center, and are of relatively small denominations, while the graduations on its other armranging from 0 to l0, for instance from the center to the right, are of relatively larger denominations and are provided with notches, at equally divided points to coincide with the graduations, the central 0 point serving as a termination of one scale and the beginning of the other.` t

A further object of -my invention .is the revision of a balance or scale beam in comination with which poises or riders are used which are so small, delicate or fragile that mechanical means must be employed for shifting these poises or riders.

It is a still further obj ect of my invention to,

provide such mechanical poise shifting means of an extremely simple construction in order to avoid interference with their manipula'- tion which may otherwise be caused by the corrosive infiuence of acids or chemical fumes to which instruments of this class are frequently exposed.

VMy invention furthermore includes 'there fore the provision of one or more rotatably and slidablymounted rods equipped with hooks so arranged as to engage with eithery of the riders or `poises in any position of vthe scales. v f

Thesel and other objects and advantages l of 4invention willbecome more fully known as the description thereof proceeds, and will then be specifically defined yin the appended claims. l j

In theV accompanying drawing, iformingla material part of this disclosure:

Fig. 1 is a front elevation'of a scale beam constructed according to my invention, with a rotatably and' slidably mounted rod equipped with a hook engaged by a plurality of poises or riders, although two hooks are shown, one is to be used at'a time.

Fig. 2 illustrates a modification of the rider or poise suspension, making possible the use of a third poise or rider.

As illustrated, the scale beam 10 of any suitable size or material, fulcrumed in its center as at 11 is provided with a suitable indicator or pointer 12 secured thereon by means of a set screw 13 or the like. In order to save weight andrmaterial a plurality of openings 14 are provided, and the ends of the beam are engaged by suitable poise or equilibrium adjusting screws 15 or the like.`

The arm- 16 of the beam 10to the left of its fulcrum 11is provided with graduations in milligrams or other relatively small denominations reading from left to center, while the arm 17 ofthe beam 1() to the right of its fulcrumllis equipped with a scale divided in relatively larger denominations as forinstance centigrams and is provided with vnotches 18 at equally divided points coinciding with the graduations. Y v

A rod 19 is rotatably and slidably supported in supports 20, 21 and is equipped with a hook 22, Vfor the suspension' of poises or riders 24, 25 arrangedto engage with either of the riders in any position of the scales.

,In the modiiied form of poise or rider suspension illustrated in Figure 2, the poises or riders 26 have preferably the form shown,

and are suspended'by means of their upper end eyes 27 from hooks 28 on the upper ends of rods '.29 passing through the rods 8O arranged above and at both sides of the scale beam 3l.

The operation of my novel scale or balance beam and its use Will be entirely clear from the above description by the simultaneous inspection of the dra-Wing, and it will be evi` dent that if both riders shown suspended above .the beam are released on the zero points on the beam, the balance is poised. By moving or shifting either rider to the right, the right arm of the beam becomes loaded in proportion. y

It Will be clear that the riders for the different denominations mayk have easily distinguishable colors. A

It will be understood that I have disclosed the preferred form of my device only Vas an example of `the many ways in which the same may be practically constructed, and that I may make such changes in the general arrangement of my device, particularly in the v scales etc., and in the construction of kthe minor details ofthe balance ,beam 'as come f Within the scope of the appended claims Without departure from the spiritl of my invention and the principles involved.

Having thus described my invention, What I claim as ne vand-desire to secure byY Letters Patent is: n

- `l. A balance beam comprising tWo series of graduations of varying denominations, a centrally located fulcrum for said beam, rotatable and sliding means above said beam, riders or poises suspended from said means, and a means for suspending said poises from said rods.

2. In combination, a balance beam fulcrumed in its center, a scale divided in relatively small denominations on one arm of said beam at one side of the ulcrum, and a scale divided in larger denominations on the other armV of said beam on the other side of its fulcrum, the latter arm notched at equally divided points'to coincide With t-he gradua tions of this arm.

3. A balance beam, a centrally locatedfulcrum for the same, a milligram scale on said beam to one side of its ulcrum, a. centigram scale on theother side of the beams fulcrum, the beam on this side notched to coincide with the scale therein, and rods rotatably and slidably arranged above said beam, hooks on said rods, and poises suspended from said hooks above the milligram and centigram scales on said beam. l e Y. Y

l; A balance beam, a centrally loca-ted fulcrum therefor, varying graduations on said beam vto both lsides Vof its fulcrum, arp-air of rotatable and slidable rods above said beam, bars passed through said rods, hooks formed on they upperl ends of saidbars, and poises or yriders suspendedfromsaid hook over the graduations on said beam. y

Signed at NeW'Rochelle, in the county of `Westchester and' State of New York, this 16th day of May, A. D. 1928. Y'

JOHN P imLLER.v l 

